Abstract
The monomeric friction coefficient (MFC) of a copolymer of styrene and butadiene (styrene, 11; 1,2-butadiene, 42; 1,4-butadiene, 47 mol%) has been determined by two experimental techniques. Four low molecular weight polymers with similar microstructure but with no molecular entanglements were synthesized. From the zero shear viscosities of these samples, the values of MFC obtained was 1.9 × 10 −9 N s m −1. The MFC was also obtained from rheological measurements on the bulk polymer and the value obtained was 2.8 × 10 −9 N s m −1. The agreement between the two values is comparable to the agreement reported in the literature for other polymers. By comparing the values obtained with MFC of other polymers, it is demonstrated that the experimentally obtained MFC is consistent with the microstructure of the polymer.
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